Surface-gage



(No Model.)

0. P. FAY.

SURFACE GAGE.

Patented Sept. 23, 1884.

INVBNTOR WITNESSES:

ATTORNEY NITE: STATES PATENT Fries.

CHARLES. P. FAY, OF SPRlNGFIELD, ASSIGNOR TO J. STEVENS & COMPANY, OFOHIGOPEE FALLS, MASSACHUSETTS.

SU RFACE-GAG E.

.ePECIPICATION forming part of Letters Patent No. 305,515, datedSeptember 23, 1884.

' Application filed May 26, 1884. (No model) I To aZZ whom, it mayconcern/.-

Be it known that I, CHARLES I. FAY, a citizen of the United States,residing at Spring field, in the county of Hampden and State ofMassachusetts, have invented new and useful Improvements inSurface-Gages, of which the following is a specification.

This invention relates to improvements in surface-gages, the objectbeing to provide a tool of this description of a simplifiedconstruction, and having improved means for supporting the pointer ofthe gage, and for delicately adjusting its extremities to the surface ofob jects.

In the drawings forming part of this speci fication, Figure l is a frontelevation, and Fig. 2 a side elevation, partly in section, of asurface-gage constructed according to my invention. Fig. 3 is asectional view of the pointer-clamping devices in connection withsections of the parts supporting the same.

In the drawings, Bis the base of the tool, in which is rigidly fixed thepost A, and on the top of the latter is fixed a nut-guide. m, open onone side, which projects beyond the side of post A, and a hole is madethrough said projecting portion to receive the screwed end of theadjusting-rod c, which is adapted to move freely up and down by the sideof post A, and is held in position by said guide and the entrance of itslower end into a hole in base 13, near the post, as shown. A nut, 0, isfitted 011 the screwed end of rod 0 and into the opening on the side ofguide m, whereby the rod and the parts attached thereto are adjustedvertically.

If preferred, the lower end of rod 0 may be made to screw into base B,its upper end being left smooth, and provided with a suitablethumb-piece or other suitable means for turning the rod to adjust it,nut f being screwed up a little free.

. The support d is placed on post A previous to fixing guide in thereon,and has a hollow branch, K, through which the rod 0 passes, and isadapted to receive within it the cylindrical head 10 of the clamp-screwi, the latter being perforated transversely to permit rod 0 to passthrough itas well as through the branch K. Two pointer-clamps, c c, ofdisk form, adapted to hold pointer a and turn with it on theirpivot-screw, are fitted onto the screw 2', one of which has a bearingagainst the end of branch K, and a nut, f, on said screw is adapted tobe screwed against the other of said disks 6, whereby they are forcedone against the other and against the end of the branch K, and the head10 of the screw 11 is strongly forced against the rod 0, thus securingthe pointer-clamps e a firmly in any position by the side of post A, b tsubject to vertical adjustment by moving rod 0," as above described. Theclamps e e have a perforation made between their inner adjacent faces,halfround in each one side of their centers, to receive therein thepointer n, which is made in the usual form, as shown.

The above-described tool is adapted to be used for surface-gaging asfollows: By properly loosening nut f the clamps, c e are so freed thatpointer a may be moved endwisc between them as desired, and at the sametime the head of screw t is so freed from its engagement with rod 0 thatthe support d and the pointer and the aforesaid clamping devices may befreely moved up or down, as may be desired, and when they and thepointer are brought to proper position, with the end of the latter nearthe surface to be gaged, nut f is tightly screwed against the clamps e,and by turning thenut 0 rod 0 is slightly moved up or down until theextreme point of the pointer is nicely adjusted to the said surface.

WVhat I claim as my invention is i A surface-gage consisting of thepointer 02,-

two clamp-disks, between which the pointer isheld, a screw having atransversely-perforated head passing through said disks, and a .the sideof post A and passing through the said hollow branch and perforatedscrew-head, and means, substantially as described, for mov ing said adjusting-rod endwise, combined and 1 operating substantially as set forth.

CHARLES I. FAY.

Vitnesses:

H. A. CHAPIN, J. D. GARFIELD.

